<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    div{
      width: 100px;
      height: 100px;
      border: 1px solid red;
    }
     #d1{
       position: absolute;
       right: 30px;
       top: 30px;

     }
     #big{
       width: 200px;
       height: 200px;
       background-color: green;
       margin:100px 0 0 100px;

     }
     #big>div{
       width: 100px;
       height: 100px;
       background-color: red;
       margin: 50px 0 0 50px;
       position: relative;
     }
     #big>div>div{
       width: 50px ;
       height: 50px;
       background-color: blue;
       position: absolute;
       left: 0;
       top: 0;

     }
  </style>
</head>
<body>
<div id="big">
  <div>
    <div></div>
  </div>
</div>
<div id="d1"> div1</div>
<div> div2</div>
<div> div3</div>
</body>
</html>